| 摘要 |
<p>A method for the manufacture of a vacuum skin package where the lower support member is formed in a suitably selected shape which process comprises feeding a flat lower web (3) of thermoplastic material with the product (6) to be packaged loaded thereon and an upper thermoplastic web (27), to a vacuum chamber (8) for skin packaging that comprises an upper element (9) comprising a heated upper concavity (11) and a lower element (10) comprising a female vacuum forming mould (16) suitably shaped to match the desired shape for the support member of the end package, closing the vacuum chamber (8) and drawing the upper web (27) toward the upper concavity (11) by differential pressure; evacuating air or gases from the space between the lower web (3) and the upper web (27), in the closed vacuum chamber (8), while maintaining the vacuum from above the upper web and from below the lower supporting web; and reintroducing air from above the upper film, thus moving the heated upper web (27) against the product (6) and the lower supporting web (3), thereby vacuum forming the lower supporting web (3) against the suitably shaped female mould cavity (19) in the lower element and bonding the upper web (27) to the lower supporting web (3) all around the product (6) to form a hermetically sealed skin package.</p> |
